1 /* $NetBSD: procfs_vfsops.c,v 1.24 1995/06/18 14:47:39 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1993 Jan-Simon Pendry 5 * Copyright (c) 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Jan-Simon Pendry. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * @(#)procfs_vfsops.c 8.5 (Berkeley) 6/15/94 40 */ 41 42 /* 43 * procfs VFS interface 44 */ 45 46 #include <sys/param.h> 47 #include <sys/time.h> 48 #include <sys/kernel.h> 49 #include <sys/proc.h> 50 #include <sys/buf.h> 51 #include <sys/syslog.h> 52 #include <sys/mount.h> 53 #include <sys/signalvar.h> 54 #include <sys/vnode.h> 55 #include <miscfs/procfs/procfs.h> 56 #include <vm/vm.h> /* for PAGE_SIZE */ 57 58 /* 59 * VFS Operations. 60 * 61 * mount system call 62 */ 63 /* ARGSUSED */ 64 procfs_mount(mp, path, data, ndp, p) 65 struct mount *mp; 66 char *path; 67 caddr_t data; 68 struct nameidata *ndp; 69 struct proc *p; 70 { 71 size_t size; 72 73 if (UIO_MX & (UIO_MX-1)) { 74 log(LOG_ERR, "procfs: invalid directory entry size"); 75 return (EINVAL); 76 } 77 78 if (mp->mnt_flag & MNT_UPDATE) 79 return (EOPNOTSUPP); 80 81 mp->mnt_flag |= MNT_LOCAL; 82 mp->mnt_data = 0; 83 getnewfsid(mp, makefstype(MOUNT_PROCFS)); 84 85 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN, &size); 86 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 87 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 88 bcopy("procfs", mp->mnt_stat.f_mntfromname, sizeof("procfs")); 89 return (0); 90 } 91 92 /* 93 * unmount system call 94 */ 95 procfs_unmount(mp, mntflags, p) 96 struct mount *mp; 97 int mntflags; 98 struct proc *p; 99 { 100 int error; 101 extern int doforce; 102 int flags = 0; 103 104 if (mntflags & MNT_FORCE) { 105 /* procfs can never be rootfs so don't check for it */ 106 if (!doforce) 107 return (EINVAL); 108 flags |= FORCECLOSE; 109 } 110 111 if (error = vflush(mp, 0, flags)) 112 return (error); 113 114 return (0); 115 } 116 117 procfs_root(mp, vpp) 118 struct mount *mp; 119 struct vnode **vpp; 120 { 121 122 return (procfs_allocvp(mp, vpp, 0, Proot)); 123 } 124 125 /* ARGSUSED */ 126 procfs_start(mp, flags, p) 127 struct mount *mp; 128 int flags; 129 struct proc *p; 130 { 131 132 return (0); 133 } 134 135 /* 136 * Get file system statistics. 137 */ 138 procfs_statfs(mp, sbp, p) 139 struct mount *mp; 140 struct statfs *sbp; 141 struct proc *p; 142 { 143 144 #ifdef COMPAT_09 145 sbp->f_type = 10; 146 #else 147 sbp->f_type = 0; 148 #endif 149 sbp->f_bsize = PAGE_SIZE; 150 sbp->f_iosize = PAGE_SIZE; 151 sbp->f_blocks = 1; /* avoid divide by zero in some df's */ 152 sbp->f_bfree = 0; 153 sbp->f_bavail = 0; 154 sbp->f_files = maxproc; /* approx */ 155 sbp->f_ffree = maxproc - nprocs; /* approx */ 156 if (sbp != &mp->mnt_stat) { 157 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 158 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 159 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 160 } 161 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 162 return (0); 163 } 164 165 procfs_quotactl(mp, cmds, uid, arg, p) 166 struct mount *mp; 167 int cmds; 168 uid_t uid; 169 caddr_t arg; 170 struct proc *p; 171 { 172 173 return (EOPNOTSUPP); 174 } 175 176 procfs_sync(mp, waitfor) 177 struct mount *mp; 178 int waitfor; 179 { 180 181 return (0); 182 } 183 184 procfs_vget(mp, ino, vpp) 185 struct mount *mp; 186 ino_t ino; 187 struct vnode **vpp; 188 { 189 190 return (EOPNOTSUPP); 191 } 192 193 procfs_fhtovp(mp, fhp, vpp) 194 struct mount *mp; 195 struct fid *fhp; 196 struct vnode **vpp; 197 { 198 199 return (EINVAL); 200 } 201 202 procfs_vptofh(vp, fhp) 203 struct vnode *vp; 204 struct fid *fhp; 205 { 206 207 return (EINVAL); 208 } 209 210 procfs_init() 211 { 212 213 return (0); 214 } 215 216 struct vfsops procfs_vfsops = { 217 MOUNT_PROCFS, 218 procfs_mount, 219 procfs_start, 220 procfs_unmount, 221 procfs_root, 222 procfs_quotactl, 223 procfs_statfs, 224 procfs_sync, 225 procfs_vget, 226 procfs_fhtovp, 227 procfs_vptofh, 228 procfs_init, 229 }; 230